CVE-2026-110382: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in NSquared Simply Schedule Appointments

The vulnerability CVE-2026-110382 in NSquared Simply Schedule Appointments is a stored cross-site scripting (XSS) flaw caused by improper neutralization of input during web page generation. This allows attackers to inject malicious scripts that persist in the application and execute in the context of other users' browsers. The affected versions include all releases from the initial version up to but excluding 1.6.12.37. The CVSS 3.1 base score is 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability.

Successful exploitation of this stored XSS vulnerability can lead to execution of arbitrary scripts in the context of affected users, potentially allowing attackers to steal sensitive information, manipulate data, or disrupt application availability. The CVSS vector indicates partial loss of confidentiality, integrity, and availability. There are no known exploits in the wild as per the provided data.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution with untrusted input and consider implementing web application firewalls or input sanitization as temporary mitigations.